BIO SCI 94 Lecture Notes - Lecture 2: Synapomorphy, Population Ecology, Continental Drift

• School: UC-Irvine
• Department: Biological Sciences
• Course: BIO SCI 94
• Professor: Nancy Burley

Document Summary

Clicker question 1: correct answer: a, a: this is breeding, b: natural selection led to giraffes having longer necks because of competition, c: bacteria responds to the environment and becomes more resistant to antibiotics due to natural selection. Pre-zygotic barrier: anything that prevents 2 organisms, evolves to lower gamete wastage, effect is to reduce mating between diverging population. Isolation in time (temporal) or space (habitat: populations adapted to different habitats or are active at different times of day or year. Allopatric speciation: occurs when populations are physically isolated, divergence through long-term spatial isolation, especially by a physical barrier (vicariance, ex. Glacier, river, canyon, mountain: species become different because the environment is different. Speciation involving failed meiosis and gamete fusion between. 2 individuals of the same species: allopolyploidy. Community: environment, biotic (living) and abiotic (nonliving, terrestrial biomes, characterized by dominant vegetation, controlled by climate (annual mean temperature & precipitation, mean temperature, global heating pattern, precipitation, hadley cells.